Physics - Electricity 10th class | 10th class physics Question

Physics - Electricity 10th class | 10th class physics Question | Electricity Chapter - Question

Physics Question for revision

Give The reason For following Question :
1. Why is the tungsten used almost exclusively for filament of electric lamps?
2. Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
3. Why does the cord of an electric heater not glow while the heating element does?
4. What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?
5. Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?

Numericals :
1. An electric lamp, whose resistance is 20 Ω, and a conductor of 4 Ω resistance are connected to a 6 V battery. Calculate (a) the total resistance of the circuit, (b) the current through the circuit, and (c) the potential difference across the electric lamp and conductor.
2. A wire of given material having length l and area of cross-section A has a resistance of 4 Ω. What would be the resistance of another wire of the same material having length l/2 and area of cross-section 2A?
3. The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source.What current will the heater draw if the potential difference is increased to 120 V?
4. Calculate the number of electrons constituting one coulomb of charge.
5. How much energy is given to each coulomb of charge passing through a 6 V battery?

Define the following terms :
1. Electric current
2. Ohms Law
3. KWH
4. Unit of current

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